Police are appealing for witnesses after a 19-year-old suffered a head injury at an 18th birthday party.
A 24-year-old was arrested on suspicion of GBH after the incident in the car park at Wyberton Sports and Social Club just after 9pm on Saturday.
He has been released on police bail until April 9.
Anyone with information should contact DC Sue-Ellen Wilson by calling 101 and quoting incident 428 of February 2.